Teeth of most reptiles and amphibians are

Options

A. Acrodont
B. Thecodont
C. Heterodont
D. Diphyodont

Answer

To answer the question regarding the type of teeth found in most reptiles and amphibians, we can analyze the options provided:

1. **Acrodont**: This type of dentition means that the teeth are fused to the margin of the jawbones and do not have roots. This is characteristic of many reptiles and amphibians.

2. **Thecodont**: This refers to teeth that are embedded in sockets within the jawbone. This type is more common in mammals and some other groups but not primarily in reptiles and amphibians.

3. **Heterodont**: This term describes organisms that have different types of teeth (e.g., incisors, canines, molars). While some reptiles may exhibit heterodont dentition, it is not a defining characteristic of all reptiles and amphibians.

4. **Diphyodont**: This refers to organisms that develop two sets of teeth (deciduous and permanent). This is typical of mammals, not reptiles and amphibians.

Based on the definitions and characteristics of each type of dentition, we can conclude that the teeth of most reptiles and amphibians are best classified as **Acrodont**.

### Final Answer:
The teeth of most reptiles and amphibians are **A. Acrodont**.